tcpclient, the author suggests we rely on the curvecpclient and curvecpmessage binaries provided by NaCl. Bump PKGREVISION.
CurveCP support. qmail-qremote resolves IP addresses for SMTP server and then calls either tcpclient or qmail-curvecpclient for TCP or CurveCP connections, respectively. Once the connection is established, qmail-rsmtp executes to send mail via SMTP.